A year after deadly avian influenza hit Minnesota, testing of more than 6,000 wild birds has yielded little insight into the role, if any, that waterfowl and other species played in the outbreak.

As the state Department of Natural Resources plans to scale back testing efforts, state poultry growers urge continued vigilance, including testing different species of wild birds and using different methods, such as testing blood instead of droppings.

Meanwhile, experts such as Michael Osterholm, director of the Center for Infectious Disease Research and Policy at the University of Minnesota, question the link to wild birds altogether.

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